/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.drools.workbench.screens.guided.dtable.client.widget.table.columns.dom.datepicker;

import java.util.Date;

import com.google.gwt.dom.client.Style;
import com.google.gwt.i18n.client.DateTimeFormat;
import org.drools.workbench.screens.guided.dtable.client.widget.table.GuidedDecisionTableView;
import org.drools.workbench.screens.guided.dtable.client.widget.table.columns.dom.textbox.SingleValueSingletonDOMElementFactory;
import org.kie.workbench.common.services.shared.preferences.ApplicationPreferences;
import org.uberfire.ext.widgets.common.client.common.DatePicker;
import org.uberfire.ext.wires.core.grids.client.widget.context.GridBodyCellRenderContext;
import org.uberfire.ext.wires.core.grids.client.widget.grid.GridWidget;
import org.uberfire.ext.wires.core.grids.client.widget.layer.GridLayer;
import org.uberfire.ext.wires.core.grids.client.widget.layer.impl.GridLienzoPanel;

/**
 * A DOMElement Factory for single-instance TextBoxes.
 */
public class DatePickerSingletonDOMElementFactory extends SingleValueSingletonDOMElementFactory<Date, DatePicker, DatePickerDOMElement> {

    private static final String droolsDateFormat = ApplicationPreferences.getDroolsDateFormat();
    private static final DateTimeFormat dateTimeFormat = DateTimeFormat.getFormat( droolsDateFormat );

    public DatePickerSingletonDOMElementFactory( final GridLienzoPanel gridPanel,
                                                 final GridLayer gridLayer,
                                                 final GuidedDecisionTableView gridWidget ) {
        super( gridPanel,
               gridLayer,
               gridWidget );
    }

    @Override
    public DatePicker createWidget() {
        return new DatePicker() {
            @Override
            protected void onLoad() {
                super.onLoad();
                if ( getElement().getParentElement() != null ) {
                    getElement().getParentElement().getStyle().setPosition( Style.Position.ABSOLUTE );
                }
            }
        };
    }

    @Override
    public DatePickerDOMElement createDomElement( final GridLayer gridLayer,
                                                  final GridWidget gridWidget,
                                                  final GridBodyCellRenderContext context ) {
        this.widget = createWidget();
        this.e = new DatePickerDOMElement( widget,
                                           gridLayer,
                                           gridWidget );

        widget.addChangeDateHandler( ( e ) -> doValueUpdate() );
        widget.addBlurHandler( ( e ) -> doValueUpdate() );

        return e;
    }

    private void doValueUpdate() {
        destroyResources();
        gridLayer.batch();
        gridPanel.setFocus( true );
    }

    @Override
    public String convert( final Date value ) {
        return dateTimeFormat.format( value );
    }

    @Override
    public Date convert( final String value ) {
        try {
            return dateTimeFormat.parse( value );
        } catch ( IllegalArgumentException iae ) {
            return new Date();
        }
    }

    @Override
    protected Date getValue() {
        if ( widget != null ) {
            return widget.getValue();
        }
        return null;
    }
}
